APPARATUS FOR PACKAGING A PRODUCT DISPLAYED ON A HOLDER, METHOD FOR PACKAGING A VACUUM BAG OF AT LEA

专利摘要:
apparatus and method for vacuum bag packaging a product and a bag packed product. There is disclosed a method and apparatus for vacuum bag packaging product (8) disposed on a support (7) comprising providing a sheet of film (61) above said support (7) with said product (8) being disposed between the support and film sheet (61); airtightly securing said sheet of film (61) to said support (7); drilling a wall of the support to form at least one through hole (70); removing at least a portion of air from within said support (7) beneath said sheet of film (61) through said at least one hole (70). also disclosed is a packaged product obtainable with said method and apparatus.
公开号:BR112015008923B1
申请号:R112015008923-2
申请日:2013-10-17
公开日:2021-08-31
发明作者:Riccardo Palumbo
申请人:Cryovac, Inc.；
IPC主号:

专利说明:

DESCRIPTION Technical Field
[0001] The present invention generally relates to an apparatus and a method for vacuum bag packaging of a product. The invention also relates to a bag-packed product. In particular, the invention relates to a bag-packed product obtainable with said apparatus and method. BACKGROUND TECHNIQUE
[0002] Vacuum packaging is a well known process for packaging a wide variety of products, in particular food products. Among the known vacuum packaging processes vacuum bag packaging is commonly employed to package food products such as fresh and frozen meat and fish, cheese, processed meat, ready meals and the like. Vacuum bag packaging is described, for example, in FR 1 258 357, FR 1 286 018, AU 3 491 504, US RE 30 009, US 3 574 642, US 3 681 092 US 3 713 849, US 4 055 672 and US 5 346 735.
[0003] Vacuum bag packaging is basically a thermoforming process. In particular, the product is typically placed on a rigid or semi-rigid support (such as a tray, bowl or glass). The support with the product placed on it is placed in a vacuum chamber where a film of thermoplastic material, held by vacuum in a position above the product placed on the support, is heated to soften it. The space between the backing and the film is then evacuated and finally a vacuum above the film is released to cause the film to drape down around the product and seal onto the surface of the backing not covered by the product, thus forming a airtight bag around the product and in the holder.
[0004] US 2007/0022717 discloses a machine for gas-tight packaging an object using a film material. The machine has a lower tool to support two trays and an upper tool having cutting devices and facing the lower tool. A film is interposed between the top tool and the bottom tool. The film is first cut to the size of the peripheral rims of the trays and is subsequently and/or simultaneously applied to the peripheral rim in a gas-tight manner. A vacuum is located in the region surrounding the tray to cause the film to draw deep in response to the formation of a pressure drop.
[0005] US 2005/0257501 discloses a machine for packaging a product arranged in a tray. The machine has a lower tool to support the tray and an upper tool with a cutting device. During operation, the film is held along an edge surrounding the tray and is deformed by the top tool in a direction extending away from the product. The space surrounding the product is then evacuated, the film and tray edge are sealed, and the film is then cut by the cutting device.
[0006] US 3 481 101 discloses a method for making bag packages using a holder provided with a plurality of openings in a rib thereof. According to this method, after the tray is filled, a heated lid film is draped over the tray and a vacuum is applied so that the air inside the package is drawn from the package and the film is drawn into a sealing condition. heat with the tray to form an airtight seal of the lid with the rib of the tray. Additional openings can be provided in the upper side walls of the tray whereby the heated film is not only drawn into sealing contact with the rib of the tray, but is also drawn down partially into the cavity.
[0007] EP 320294 discloses a bag packaging method in which a product loaded tray provided with a vent in its side wall is placed in a vacuum cylinder, an excess of the thermoplastic film is retained on the tray by a frame and heated until it begins to fold over the product, then vacuum is applied under the tray to pull the film to conform to the product surface and over and around the tray rim in a thermally cured corrugated seal. The excess film is then trimmed.
[0008] In most of the above solutions, removal of air from inside the support tray is only possible while the film is held above the support tray and product. Once the film comes in contact and seals the top edge of the tray, air can no longer be removed from inside the tray. Thus, particularly when a deep tray is used as a support for the product, pockets of air can disadvantageously remain trapped between the film and the lower surface of the support. These air pockets can negatively influence the shelf life of the product as well as the consumer's impression of the packaging.
[0009] In the bag packaging methods of US 3481101 and EP 0320294, the openings provided in the support tray allow removal of air from within the support, even after the film has contacted the support tray, thus reducing the risk of leaving pockets of air in the package. While these solutions have improved the ability to remove air from within the tray, the packaging methods described in US 3481101 and EP 0320294 require the use of properly designed trays. This implies a certain burden on the production chain. Also, the position or size of holes or ventilation channels present in the tray may not always be optimized for the specific packaging machine. Additionally, the presence of holes in the tray walls causes an undesirable aesthetic perception of the overall package.
[0010] Trays with prefabricated holes are known from US4919955, WO9714313 and US2005074531. The holes present in the trays disclosed in US4919955 and US2005074531 are provided with a valve means.
[0011] It is, therefore, an object of the present invention to provide an apparatus and a method capable of adequately solving the problem of removing air from the tray, without prejudice in terms of the total cost of the packaging.
[0012] Furthermore, it is an auxiliary object to provide a method and an apparatus which are able to efficiently remove air from the tray during packaging.
[0013] Additionally, it is an object to provide a method and an apparatus which can be implemented without the need for complex changes in conventional packaging systems.
[0014] Another auxiliary object is an apparatus capable of operating in a safe manner.
[0015] An additional auxiliary object is an apparatus and method capable of achieving the goal of air removal without prejudice to the aesthetics of the final packaged product.
[0016] Another object of the invention is a new package having a design allowing efficient air removal and improving the aesthetic perception of the package. summary
[0017] At least one of the above objects is substantially attained by an apparatus and by a method according to one or more of the appended claims.
[0018] Apparatus and processes in accordance with aspects of the invention and capable of achieving one or more of the above objects are described herein below.
[0019] According to a first aspect, the present invention provides a machine:
[0020] A 1st aspect involves an apparatus (1) for packaging a product (8) disposed on a support (7), said support (7) having a base wall and side wall, said apparatus (1) comprising :
[0021] a structure (10);
[0022] a transport assembly (2) arranged on the frame (2) and configured to move one or more supports (7) along a predefined path;
[0023] a packaging assembly (5) carried by said structure (10) and operative at a packaging station (201) positioned along said path, the packaging assembly (5) being configured to sealingly secure a film sheet (61) to said one or more supports (7);
[0024] at least one drilling unit (100) having a drilling tool (101) operable between a rest position, where the tool (101) is moved away from the side wall of said support (7), and an operating position , where the tool (101) acts on said support (7) and forms at least one through hole (70) in said side wall; and
[0025] a vacuum arrangement (102), for example, comprising one or more pumps, configured to remove air from within said support (7) beneath said film sheet (61) at least in part through at least minus one hole referred (70).
[0026] In a 2nd aspect according to the 1st aspect, the apparatus further comprises: - a retainer (103) configured to maintain in a predetermined position the support (7) at least during drilling, - at least one actuator (104) connected to at least one respective drilling tool (101) and configured to move the drilling tool (101) according to a pre-fixed drilling direction (DP) intersecting the side wall of said support (7) when the latter is placed in said predetermined position.
[0027] In a 3rd aspect according to any of the preceding aspects, the drilling tool (101) has a pointed tip (105) configured to progressively contact the side wall of the support (7) upon displacement of the drilling tool (101) from the rest position to the operating position.
[0028] In a 4th aspect according to the preceding aspect the sharp point (105) has one or more sharp edges (106), each of said sharp edges (106) being positioned on the sharp point (105) so as to define a side profile which is inclined with respect to a pre-set direction of perforation (DP), said cutting edges (106) being positioned and configured so that by perforating the side wall of the support (7), the sharp point (105) cuts a flap element into the sidewall.
[0029] In a 5th aspect according to any of the preceding aspects the drilling tool (101) has an elongated conformation along a longitudinal axis (101a) of predominant development and the lateral profile of the cutting edge is inclined in an acute angle (α) with respect to said longitudinal axis of the drilling tool.
[0030] In a 6th aspect according to any of the foregoing aspects said pointed tip (105) of the drilling tool (101) comprises two cutting edges (106) having distal portions (106a) converging to form a geometry V-shaped at a distal end of the tip (105), the two distal portions (106a) being angled by an angle (α) with respect to a longitudinal axis (110a) of the drilling tool (101).
[0031] In a 7th aspect according to the preceding aspect the cutting edges include two additional portions (106b), adjacent and following the distal portions (106a), the additional portions (106b) ending in non-cutting surfaces (107) which extend towards a proximal end of the tip (105) and delimit an opening (105b),
[0032] wherein additional portions (106b) of the cutting edges (106) converge to define non-cutting surfaces (107).
[0033] In an 8th aspect according to the preceding aspect, the additional portions (106b) of the cutting edges (106) are arc-shaped.
[0034] In a 9th aspect according to the 7th and 8th aspects, the non-cutting surfaces (107) extend a distance (d) from each other which is less than the maximum distance (w) between the cutting edges (106), so that by perforating the side wall of the support (7), the pointed tip (105) cuts a flap element (70a) in the side wall and the non-cutting surfaces (107) force said element flap in an open position, wherein portions of the surfaces (107) define an opening (105b) of sufficient size to allow suction of air/gas from within the support (7).
[0035] In a 10th aspect according to any one of the preceding aspects, the drilling tool (101) of each drilling unit (100) defines a nose opening (109) connected to a suction opening (101; 105b) spaced from the tip opening and in fluid communication with said vacuum arrangement (102) in order to remove air from within said support (7) when the tip of the drilling tool (105) is inserted into at least one hole referred to (70).
[0036] In an 11th aspect according to any of the preceding aspects the structure (10) defines a sliding plane (20) for the support (7) and wherein the transport assembly (2) comprises a conveyor (21 ) having at least one portion positioned above the sliding plane (20) and configured to move the support (7) above the sliding plane (20) and along said path of a charging station (200), where one or more supports are received by the conveyor, to the packaging station (201), where at least one support (7) can be positioned.
[0037] In a 12th aspect according to any of the foregoing aspects, said perforation unit (100) is carried by the structure and operates in correspondence with the packaging station, the perforation unit (100) being configured to form at least one hole in the side wall of at least one support present in the packaging station.
[0038] In a 13th aspect according to any of the foregoing aspects said perforation unit (100) operates in correspondence with a tray holding station configured to retain in pre-fixed positions a series of empty holders (7), the holding station being operative at or upstream of the charging station, the perforation unit (100) being configured to form at least one hole in the side wall of at least one support located in the tray holding station .
[0039] In a 14th aspect according to any of the preceding aspects the sliding plane (20) has an opening (20a) located in correspondence with the packaging station and the packaging assembly (5) comprises a base unit (53) configured to receive and retain the support (7) and an upper unit operating above the base unit (53) and configured to position the film sheet (61) above the base unit (53).
[0040] In a 15th aspect according to the preceding aspect the base unit and the upper unit are relatively movable so as to place a support ring (7) and a corresponding portion of the film sheet (61) in mutual contact between a heated surface of the upper unit and an abutment surface of the base unit (53).
[0041] In a 16th aspect according to either of the two preceding aspects the base unit (53) defines a chamber configured to house at least one said support (7) and presents passages (530a, 530b; 530a', 530b '), or on its side wall or on its bottom wall, designed to place in fluid communication the vacuum arrangement (102) and a volume (300; 300') defined at least between an external surface of the support (7) and an inner surface of the base unit (53).
[0042] In a 17th aspect according to any of the preceding aspects, the apparatus comprises a control unit (120) connected to the transport set (2), the transport set (5), the drilling unit ( 100) and the vacuum arrangement (101), said control unit being configured to:
[0043] command the transport assembly (2) to move said support (7) along the predefined path;
[0044] command the packaging assembly (5) to sealingly secure the film sheet (61) to said support (7) when the latter has reached the packaging station;
[0045] command the drilling unit (100) to move the drilling tool (101) from the rest position to the operating position, thereby creating at least one through hole (70) in said support side wall; and
[0046] command the vacuum arrangement (102) to remove air from inside said support (7) under said film sheet (61) through at least one said hole (70).
[0047] In an 18th aspect according to the preceding aspect the control unit (120) is further configured to:
[0048] determine when the support (7) is positioned on the base unit (53) of the packaging assembly (5) and,
[0049] command the displacement of the drilling tool (101) from the rest position to the operating position only after the support (7) is correctly positioned on the base unit (53).
[0050] In a 19th aspect according to either of the two preceding aspects, the control unit (120) is further configured to:
[0051] determine when the drilling tool (101) has reached the operating position and,
[0052] command the vacuum arrangement (102) to remove air from within said support (7), while keeping the drilling tool (101) in said operating position.
[0053] In a 20th aspect according to the 17th or 18th aspect the control unit (120) is further configured to:
[0054] command the vacuum arrangement (102) to remove air from the volume (300; 300') defined between the base unit (53) and the outer surface of the support (7) before the drilling tool (101) has started to create at least one said hole, so that a pressure difference is defined between the interior of the support or tray (7) and the volume (300; 300') and, subsequently or contemporaneously,
[0055] command the displacement of the drilling tool (102) to the operating position by progressively piercing the support side wall,
[0056] continue to command the vacuum arrangement (102) to remove air from within said support (7), while keeping the drilling tool (101) in said operating position.
[0057] A 21st aspect involves a method for vacuum bag packaging of at least one product (8) disposed on a holder (7) using the apparatus of any of the preceding aspects.
[0058] A 22nd aspect involves a method for vacuum bag packaging of at least one product (8) disposed on a support comprising the following steps:
[0059] providing a film sheet (61) above said at least one support (7) with said product (8) being disposed between the support and the film sheet (61);
[0060] airtightly attaching said sheet of film (61) to said support (7);
[0061] perforating a wall of the support to form at least one through hole (70);
[0062] remove at least a portion of air from within said support (7) under said film sheet (61) through said at least one hole (70).
[0063] In a 23rd aspect according to the preceding aspect, the method steps are executed sequentially.
[0064] In a 24th aspect according to any of the preceding aspects 21st to 23rd, the method comprises moving the support (7) above a sliding plane (20) and along a predefined path of a support loading station (200) to a packaging station (201), where the support housing the product is provided with said film sheet (61) airtightly attached.
[0065] In a 25th aspect according to any of the preceding aspects from the 21st to the 24th the drilling step occurs when the support is at a station selected from the group comprising:
[0066] the packaging station,
[0067] a tray holding station located upstream of the charging station,
[0068] a tray holding station located in the charging station,
[0069] a tray forming station located upstream of the packaging station.
[0070] In a 26th aspect according to any of the preceding aspects from the 21st to the 25th the drilling step comprises the following substeps:
[0071] displace a drilling tool (101) according to a pre-set direction intersecting the side wall of said support (7); and
[0072] progressively contact the outer surface of the side wall with the drilling tool (101) and form a tab element (70a) connected to the side wall of the support (7).
[0073] In a 27th aspect according to any of the preceding aspects 21st to 26th the air removal step comprises:
[0074] remove air from a volume (300; 300') defined between a base unit (53) receiving the support (7) and the outer surface of the support (7) before a drilling tool (101) has begun to create at least one said hole, so that a pressure difference is defined between the interior of the support (7) and the volume (300; 300') and, subsequently or contemporaneously,
[0075] command the displacement of the drilling tool (103) to the operating position to progressively drill the support side wall,
[0076] continue to remove air from within said support (7), while keeping the drilling tool (101) in said operating position.
[0077] In a 28th aspect according to any one of the preceding aspects of the 21st to the 27th the step of airtightly securing said sheet of film (61) to said support (7) comprises:
[0078] block a support ring (7) and a corresponding portion of the film sheet (61) between a heated surface of a top unit (51; 51a, 51b) and an abutment surface of a base unit (53 ),
[0079] retain the support (7) so that the collar of the support (7) and the corresponding portion of the film sheet (61) are in mutual contact,
[0080] wherein the perforation step occurs before, during or after said blocking step.
[0081] In a 29th aspect according to any of the preceding aspects 21st to 28th the step of removing air further comprises waiting until a predetermined period of time has elapsed since initiation of the step of removing air or a preset pressure has been reached within said support (7) beneath said sheet of film (61).
[0082] In a 30th aspect according to any of the preceding aspects 21st to 29th, the method comprises the additional steps of:
[0083] extract the drilling tool (101) from said hole (70), and
[0084] align the flap element (70a) to the side wall, so as to substantially close said hole, with the film sheet (61) draped over the product and welded to the support holding the flap element (70a) in said closing position and sealingly sealing at least one hole (70) in the side wall.
[0085] In a 31st aspect according to the preceding aspect the extraction of the drilling tool occurs either when the final desired vacuum level has been reached within the support (7) or when the vacuum has reached an intermediate level between the vacuum level and the pressure level present before the start of air removal.
[0086] In a 32nd aspect according to any of the foregoing aspects from 21st to 31st the progressive perforation of the sidewall of the holder comprises forming, optionally starting from a single breaking point, a cut line (70b) on the side wall.
[0087] In a 33rd aspect according to the preceding aspect, said cut line has an open conformation, so that the flap element (70a) is integral with the side wall and delimited by said open cut line, the said flap element (70a) being connected to the side wall by a hinge line (70c) extending between ends of said cut line (70b).
[0088] In a 34th aspect according to any of the preceding aspects from 21st to 33rd the side wall of the bracket (7) ascendingly ends in a horizontal rim projecting outwards, said step of fixing from air-tightly method of said sheet of film (61) to said support (7) comprising welding the sheet of film (61) to at least the upper surface of said horizontal rim.
[0089] In a 35th aspect according to any of the preceding aspects from 21st to 34th, said support (7) is a tray having a bottom wall of polygonal shape, optionally rectangular, and in which the perforation step comprises forming said hole(s) in correspondence with the corner(s) of the side wall.
[0090] In 36th aspect according to any of the preceding aspects from 21st to 35° said support (7) is a tray having one or more horizontal edges present in the upper half of the side wall area, each of said horizontal edges being located in correspondence with one of said corners.
[0091] In a 37th aspect according to the preceding aspect each of said horizontal edges is substantially in the form of a right triangle.
[0092] In a 38th aspect according to the preceding aspect vertical and mutually perpendicular facets emerge from the orthogonal converging edges of each of said horizontal edges.
[0093] In 39th aspect according to any of the preceding aspects from 36th to 38th the perforation step comprises forming said hole(s) in correspondence with a respective corner in the form of an opening through the sidewall portion.
[0094] A 40th aspect involves a vacuum bag package (700) of the type obtained with the method of any of the preceding aspects 21st to 39th.
[0095] A 41st aspect 41st involves a vacuum bag package (700), for example, of the type obtainable with the method of any of the preceding aspects 21st to 39th, comprising:
[0096] a tray (701) having a bottom wall (702) and a side wall (703) extending upwardly from said bottom wall (702), the side wall having at least one hole (70) in the side wall (703) ;
[0097] a flap element (70a) connected to the side wall of the tray (703), wherein the flap element (70a) is positioned in correspondence with said hole (70);
[0098] a product (706) loaded on the tray (701); and
[0099] a draped film (705) over the product and welded to an inner surface of the tray (701) wherein at least a portion of said film (705) holds the flap element (70a) in a fixed position relative to the side wall (703) and sealingly closes at least one said hole (70).
[00100] In a 42nd aspect according to either of the two preceding aspects, the vacuum bag package has the flap element (70a) aligned with the side wall of the tray (703) and substantially closing said hole (70 ), the film (705) adhering to the tab element (70a) which coincides with the contour of said hole (70) and remains level with respect to a surface of the side wall (703).
[00101] In a 43rd aspect according to any of the preceding aspects from 40th to 42nd the flap element (70a) is integral with the sidewall (703) and delimited by an open cut line (70b), said flap element (70a) being connected to the side wall (703) by a hinge line (70c) extending between the ends of said cut line (70b).
[00102] In a 44th aspect according to the preceding aspect, the hinge line (70c) has a length (l) not greater than the maximum width (w) of the flap element measured parallel to the hinge line (70c).
[00103] In a 45th aspect according to the preceding aspect the hinge line (70c) has length (1) greater than 0.2 (1/5) of said maximum width (w) of the flap element.
[00104] In a 46th aspect according to any of the preceding aspects from 43rd to 45th the height (h) of the flap element - measured perpendicular to the hinge line - is greater than 0.2 of the length (l) of the hinge line.
[00105] In a 47th aspect according to any of the preceding aspects 43rd to 46th the height (h) of the flap element - measured perpendicular to the hinge line - is greater than 0.5 of the length (l ) of the hinge line.
[00106] In a 48th aspect according to any of the preceding aspects 43rd to 47th the height (h) of the flap element - measured perpendicular to the hinge line - is less than 3 times the length of the same line of hinge.
[00107] In a 49th aspect according to any of the foregoing aspects 40° to 48° the sidewall of the bracket (7) ends upwardly in an outwardly projecting horizontal rim (704).
[00108] In a 50th aspect according to the preceding aspect said film (705) is also welded to the upper surface of said horizontal rim.
[00109] In a 51st aspect according to any of the preceding aspects 40° to 50° the bottom wall of the tray (702) is polygonal in shape, optionally rectangular.
[00110] In a 52nd aspect according to any of the preceding aspects 40th to 51st the hole or holes (70) is/are located in correspondence with corner(s) of the side wall (703 ).
[00111] In a 53rd aspect according to any of the preceding aspects 40th to 52nd the sidewall (703) comprises one or more horizontal edges present in the upper half of the sidewall area (703),
[00112] wherein each of the horizontal edges is located in correspondence with one of said corners.
[00113] In a 54th aspect according to the preceding aspect each of said horizontal edges is substantially in the form of a right triangle.
[00114] In a 55° aspect according to the preceding aspect vertical and mutually perpendicular facets emerge from the orthogonal converging edges of each of said horizontal edges.
[00115] In a 56th aspect according to any of the preceding aspects from 40th to 55° each hole (70) is formed in correspondence with a respective corner of the support or tray in the form of an opening through the side wall portion (703).
[00116] In a 57th aspect according to any of the foregoing aspects 40° to 56° of the sidewall (703) ends up in a horizontal rim projecting outwards and comprises horizontal edges in corner regions where - in an inner edge of each horizontal edge - the sidewall (703) features a protective protrusion, each horizontal edge being positioned vertically at a lower height compared to said horizontal rim projecting outwardly and extending between said protrusion and an additional sidewall portion (703) moving away from the horizontal edge and terminating in said horizontal rim. Brief description of the drawings
[00117] The present invention will become clearer by reading the following detailed description, given by way of example and not limitation, to be read with reference to the accompanying drawings, in which:
[00118] Figure 1 is a side view of an apparatus according to a first embodiment of the present invention with certain components only schematically represented.
[00119] Figure 2 is a more detailed side view of a portion of the machine in Figure 1.
[00120] Figure 3 is an enlarged view of a detail of Figure 2.
[00121] Figure 4 is a perspective view of a portion of the apparatus of Figure 1 during operation.
[00122] Figures 5a to 5h show various steps of vacuum bag packaging according to an embodiment of the invention.
[00123] Figure 5i shows an enlarged view of a detail of Figure 5d.
[00124] Figure 5j shows an enlarged view of a variant of the particular disclosed in Figure 5d.
[00125] Figure 5k shows an enlarged view of a further variant of the particular disclosed in Figure 5d.
[00126] Figures 6a to 6h show various stages of vacuum bag packaging according to a second variant.
[00127] Figure 7 is a perspective view of another apparatus according to a second embodiment of the present invention with certain components only schematically represented.
[00128] Figures 8a, 9a, 9a', 10a, 11a, 12a represent perspective views of the tip portions of several possible variants of drilling units according to aspects of the invention.
[00129] Figures 8b, 9b, 9b', 10b, 11b, 12b respectively represent cross sections of the tip portions of Figures 8a, 9a, 9a', 10a, 11a, 12a.
[00130] Figures 8c, 9c, 9c', 10c, 11c, 12c, respectively, represent longitudinal sections of the tip of Figures 8a, 9a, 10a, 11a, 12a.
[00131] Figures 13 to 15 are schematic and partially broken sections of trays or supports after perforation according to aspects of the invention.
[00132] Figure 16 is a perspective view of a tray or support before punching takes place.
[00133] Figure 17a is a top view of the tray of Figure 16.
[00134] Figure 17b is a cross section of the corner area of the tray or holder according to the section plane shown in figure 17a.
[00135] Figure 18a is a top view of an additional example tray or support before punching takes place.
[00136] Figure 18b is a cross section of the corner area of the tray or support according to the section plane shown in figure 18a.
[00137] Figure 19a is a top view of yet an additional example of tray or support before punching takes place.
[00138] Figure 19b is a cross section of the corner area of the tray or support according to the section plane shown in figure 19a.
[00139] Figures 20 and 20a are broken cross sections of a packet according to another aspect of the invention.
[00140] Figures 21a to 21d are enlarged and schematic views of the sidewall area of a tray intercepted by a hole and a flap element according to aspects of the invention.
[00141] Figures 22a, 22b, 22c are respectively a top, side and front view of a further embodiment of a tip portion of the drilling unit according to another aspect of the invention.
[00142] Figure 22d is a perspective view of the tip portion of figures 22a to 22c; and
[00143] Figure 23 is a perspective view of the tip portion of Figures 22a to 22c in an operating condition where the tip portion pierces the sidewall of a tray. Detailed Description
[00144] It should be noted that in this detailed description corresponding parts shown in the various Figures are indicated with the same reference numeral in all Figures. Note that the Figures are not to scale. First device mode 1
[00145] Figures 1, 2, 3 and 4 show an apparatus 1 for packaging a product arranged in a support or tray according to an embodiment of the present invention. Apparatus 1, for example, is configured for vacuum bag packaging of the product where a thin film of plastic material is draped over the product and intimately adheres to an upper rim and the inner surface of the support or tray, as well as the surface of the product. thus leaving a minimal amount, if any, of air inside the package.
[00146] The apparatus 1 comprises a frame 10, a transport assembly 2 configured to move the support or tray 7, a roll support assembly 3, a film cutting assembly 4, a packaging assembly 5 and an arrangement of vacuum 102 (visible in the schematic drawings of figures 5a, 5b), such as a vacuum pump or the like. Obviously, the presence of a film cutting assembly is not essential with respect to the claimed invention: for example the film can alternatively be directly supplied from the roll to the support or tray without being pre-cut; in this case the film cutting - if necessary - can occur after the film has been fixed to the support 7 and/or after air has been withdrawn from within the support 7. The support transport assembly 2 comprises a sliding plane 20 and a belt conveyor 21 arranged in sliding contact with sliding plane 20. Carrier transport assembly 2 is loaded, for example, fixed to frame 10 so that sliding plane 20 is substantially horizontal and conveyor belt 21 sliding in contact with the sliding plane 20 in the horizontal direction indicated by arrow A1 shown in Figure 1. The transport assembly 2 disposed on the frame 10 is configured to move the support or tray 7 along a predefined path of a loading station 200, where supports or trays that may already be filled with the respective product(s) are positioned, to a packaging station 201, where the packaging assembly 5 operates in order to securely securely. Attach a sheet of film 61 to each holder or tray 7, as will be explained here below in detail. Note that the products can be positioned on the stand or tray 7, either upstream of the charging station 200 or at any location between the charging station and the packaging station 201.
[00147] Next to the structure 10 and in correspondence with the packaging station 201, the sliding plane 20 has an opening 20a (visible, for example, in Figures 5a to 5h) suitable to be engaged by the packaging assembly 5, as will be described in more detail below. The support conveyor assembly 2 further comprises a motor, for example a stepping motor unit 22, for operating the conveyor belt 21 with stepwise motion. The roll support assembly 3 may comprise two rotating cylinders 31, 32 projecting horizontally from an upper part of the frame 10 and suitable for supporting a roll of film 6. Optionally, the roll support assembly 3 may further comprise an arm 33 fixed to the frame 10 and suitable to prevent axial movement of the film roll 6. In addition, the roll support assembly 3 (see Figure 2) may comprise film punching devices 34 configured essentially to provide the correct profile for the film edges match when cut crosswise in cut set 4, tray mouth shape with rounded corners. Punching devices 34 can also help to keep an unwound portion of film 60 pulled from roll of film 6 substantially vertically aligned. Alternatively, the film can be unwound from the film roll 6 and moved to a first drive roll horizontally rather than vertically as illustrated in the Figures. In such a case, the punching devices 34 can be positioned closer to the film roll 6, in the space between the film roll 6 and said first propeller roll, and rotated 90° to punch the film while it is horizontal.
[00148] The film rolled on film roll 6 can be made of a flexible multilayer material comprising at least an external heat-sealable first layer, an optional gas barrier layer and an external heat-resistant second layer. The outer heat sealable layer may comprise a polymer capable of welding to the inner surface of the supports carrying the products to be packaged such as, for example, ethylene homo- or copolymers such as LDPE, ethylene/alpha-olefin copolymers, cup - ethylene/acrylic acid polymers, ethylene/methacrylic acid copolymers and ethylene/vinyl acetate copolymers, ionomers, copolyesters, for example PETG. The optional gas barrier layer preferably comprises oxygen-impermeable resins such as PVDC, EVOH, polyamides and blends of EVOH and polyamides. The external heat resistant layer can be made of ethylene homo or copolymers, ethylene/cyclic olefin copolymers such as ethylene/norbornene copolymers, propylene homo or copolymers, ionomers, (co)polyesters, (co)polyamides . The film can also comprise other layers, such as adhesive layers or raw layers, to increase the film's thickness and improve its mechanical properties. In one embodiment, one or more layers of the film are crosslinked to improve the film's strength and/or its heat resistance. Crosslinking can be achieved using chemical additives or subjecting the film layers to an energetic radiation treatment. The film preferably has a thickness of between 50 microns and 200 microns, more preferably between 60 and 180 microns and even more preferably between 70 microns and 150 microns. The film preferably has a width substantially equal to or a few mm smaller than the width of the support carrying the product to be packaged.
[00149] The film cutting assembly 4 preferably comprises a cutting device 40 with a cutting blade 401 and a first piston 41. The first piston 41 can be replaced by any other type of electric, pneumatic or hydraulic linear actuator. The first piston 41 is preferably fixed to the frame 10 below the roll support assembly 3 and is connected to the cutting device 40 so as to push and pull in the horizontal direction indicated by the double arrow A2 shown in Figure 3. The cutting assembly of film 4 further comprises a bearing block 42 and a second piston 43. The second piston 43 can be replaced by any other type of linear actuator, electric, pneumatic or hydraulic. The second piston 43 preferably is fixed to the frame 10 and is connected to the support block 42 so as to push and pull in the vertical direction indicated by the double arrow A3 shown in Figure 3. The support block 42 preferably comprises a plate. backing 421 having a series of holes and a backing member 422 having a slit 423. Cutting device 40 and backing block 42 preferably are arranged so that the unwound portion of film 60 pulled from roll of film 6 is situated. between them.
[00150] The packing assembly 5 shown in Figures 1 to 4 comprises a rotating cylinder 50 mounted on the frame 10 and suitable for rotating around its X axis, as indicated by the double arrow A4 shown in Figure 3. The X axis, of preferably, it forms an angle of about 45° with the vertical direction. The rotary cylinder 50 can be replaced by any other type of electric, pneumatic or hydraulic rotary actuator. Furthermore, the packaging assembly 5 comprises two film transfer plates 51a, 51b and two third pistons 52a, 52b. The third pistons 52a, 52b can be replaced by any other type of electric, pneumatic or hydraulic linear actuator. The third pistons 52a, 52b are connected to the rotating cylinder 50 so as to form a substantially right angle between them, i.e. one of the two third pistons (eg 52a) has its axis oriented vertically and the other (eg. , 52b) has its axis oriented horizontally, as shown in Figure 3. Each of the third pistons 52a, 52b is connected to a respective film transfer plate 51a, 51b so as to push and pull along the direction indicated by the double arrows A5 and A6 respectively. By rotating the rotating cylinder 50 about the X axis through an angle of about 180° (either clockwise or counterclockwise), the position of the two pistons 52a, 52b and respective film transfer plates 51a, 51b can be exchanged. Each film transfer plate 51a, 51b can be provided with a heatable surface 510 and with at least one opening 520 (visible in Figures 5a to 5h) connected to the aforementioned vacuum arrangement 2. Transfer plates 51a and 51b are illustrated in the drawings as flat surfaces according to a possible embodiment of the present invention. However, it can also be envisaged to use molded transfer plates having an internal concavity with flat edges around corresponding to the rim of the support carrying the product to be packaged. This would have the advantage of also allowing the packaging of products protruding from the support.
[00151] The packaging assembly 5 further comprises a base unit 53 and a fourth piston 54. The fourth piston 54 can be replaced by any other type of electric, pneumatic or hydraulic linear actuator. The fourth piston 54 is fixed to the frame 10 below the sliding plane 20 and is connected to the base unit 53 so as to push and pull at least a part of it in the vertical direction indicated by the double arrow A7 shown in Figure 3 through the opening 20a of the sliding plane 20.
[00152] Each of the transfer plates 51a, 51b (alternatively) forms an upper unit that cooperates with the base unit 53 to define a retainer 103 configured to hold the support 7 in a predetermined position during the piercing of the side wall of the support or tray 7. Indeed, in accordance with one aspect of the invention, the support or tray 7 is moved to the packaging station 201, held in place by a retainer 103 formed by the base unit 53 and upper unit 51a, 51b and , then drilled to create one or more holes 70 in the sidewall. In practice, the base unit 53 and the upper unit (formed by plate 51a or plate 51b) are relatively movable so as to place a rim 7a of support 7 and a corresponding portion 61a of film sheet 61 in mutual contact between a surface. the top unit and a base unit abutment surface 53 (see detail in Figure 5i). The apparatus 1 comprises at least one drilling unit 100 having a drilling tool 101 operable between a rest position, where the tool 101 is spaced from the side wall of said support or tray 7 and an operational position, where the tool 101 acts on the said support 7 and forms at least one through hole 70 in said side wall. In more detail, the or each drilling unit 100 (in Figures 5a to 5i two drilling units are shown, but of course more than two drilling units can be provided) comprises an actuator 104 (which can be a pneumatic piston, a hydraulic piston or an electric actuator or other type of actuator) connected to the drilling tool 101 and configured to move the drilling tool 101 according to a pre-fixed drilling direction DP intercepting the side wall of said support 7 when the latter is placed on the said predetermined position.
[00153] Note that although, for example, Figure 5c shows a drilling tool moving horizontally, each drilling unit can also be configured to move the drilling tool, for example, vertically, as shown in Figure 5j: note that in this case the drilling tool can pierce a horizontal edge formed by the side wall of the tray or support 7 below the vertically upper rim 7a.
[00154] Possible conformations of the drilling tool in accordance with aspects of the invention are shown in Figures 8a-8c, 9a-9c, 9a'-9c', 10a-10c, 11a-11c and 12a-12c. As shown in these figures, the drilling tool 101 has a sharp point 105 configured to progressively contact the side wall of the holder 7 upon displacement of the drilling tool 101 from the rest position to the operating position: in practice the sharp point moves in the direction of the tray or support 7 and is thus shaped so as to initially perforate the side wall in a very limited area, for example in correspondence with a single point, and then progressively create a cut line. In this regard, the sharp point 105 has one or more cutting edges 106: each cutting edge is defined by a sharp surface positioned in correspondence with the edges of the point 105.
[00155] The examples in Figures 8a-8c, 9a-9c and 9a'-9c' have a continuous cutting edge extending along a closed line and having a polygonal shape, eg a square or rectangular or rhomboid shape ( see sections in figures 9b and 9b') or rounded (see section in figure 8b). The cutting edge lies on a plane that is inclined by an angle α with respect to a longitudinal axis 110a of tool 110. The most forward portion of the edge may define a cutting line (as in Figure 9a) or a cutting point (as in figure 9a').
[00156] In the example of figures 10a-10c, the tip comprises two cutting edges 106 converging to form a V-shaped geometry (see figure 10a). The two converging cutting edges lie on a plane that is inclined by an angle α with respect to a longitudinal axis 110a of tool 110 (figure 10c). The most forward portion of the tip where the two cutting edges converge defines a cutting point (figures 10a, 10c). The converging cutting edges 106 terminate in surfaces 107 which, when the tip is inserted into the side wall of the holder or tray 7, help to keep tab 70a open (figure 10d). As shown in Figure 10a, the two surfaces 107 can extend parallel to each other and to the axis 110a. As shown in Figure 10d the tip may not define a hollow passage and air may thus be evacuated by the window 105b defined by surfaces 107 and by the outer surface of the side wall of the holder 7.
[00157] The examples of Figures 11a, 11c, 12a-12c have two cutting edges, each being symmetrically disposed on a respective side of the tip 105, so that the tip presents symmetry in relation to a plane of symmetry passing through the axis longitudinal axis 110a of tool 110. Each of the cutting edges 106 is inclined by an angle α with respect to a longitudinal axis 110a of tool 110 (Fig. 12c).
[00158] A further embodiment of a point 105 is shown in figures 22a-22d and 23. In the present embodiment, the point comprises two cutting edges 106 having distal portions 106a converging to form a V-shaped geometry (see figure 22a) at the distal end of tip 105. The two distal portions 106a of cutting edges 106 can be defined by lateral boundaries of a flat base 105a of tip 105 and can be angled by an angle α with respect to a longitudinal axis 110a (refer again to figure 22a). The cutting edges also include two additional portions 106b, adjacent to and following the distal portions 106a, emerging from said base 105; in accordance with one aspect, the two additional portions 106b are continuously joined to the portions 106a and can progressively emerge from the base 105a to form a substantially arc-shaped profile, as seen in Figure 106b. Portions 106 terminate in non-cutting surfaces 107 which extend towards the proximal end of tip 105 and delimit an opening 105b facing base 105a. Uncut surfaces 107 may extend substantially parallel to lower surface 105a and axis 110a. Furthermore, as shown in Figure 23, the opening 105b bounded by the surfaces 107 extends axially parallel to the axis 110a so that when the tip penetrates through the side wall of the holder or tray 7, the flap 70a is held open by forward portions. of surfaces 107, while the rearward portions of surfaces 107 define an opening or window 105b of sufficient size to allow suction of air/gas from within the tray. As shown in the view of Figure 22b the portions 106b of the cutting edges 106 may be arcuate-shaped and thus converge so that parallel surfaces are defined extending a distance 'd' from each other which are smaller than the maximum distance 'w' between cutting edges 106: this, as shown in figure 23, offers the advantage that surfaces 107 can efficiently urge and hold the flap in the open position when the tip 105 pierces the side wall of the holder.
[00159] In the examples shown, the drilling tool 101 has an elongated shape, eg straight, and extends along the predominant development longitudinal axis 101a which is basically in line with the drilling direction DP. In all of the above examples the pointed tip 105 has cutting edges slanted with respect to the axis 110a and thus slanted with respect to said pre-fixed DP drilling direction, so that upon perforation of the support side wall 7, the tip pointed 105 progressively cuts a flap element in the sidewall as shown in Figure 5i: advantageously (at least with respect to embodiments of Figures 9a', 10a, 22a) the cut can start substantially in correspondence with a single point and then propagate so that the piercing force can be minimized.
[00160] The flap element can be fixed to a lower portion of the support side wall 7 or to an upper portion of the support side wall 7 (see Figures 13 and 14). Alternatively, if the punching tools shown in Figures 11a, 11c, 12a-12c are used, two opposing flap elements can be created as shown in Figure 15.
[00161] According to a further aspect, as shown in the example of Figures 10a-10c and in the example of Figures 22a-22d, the tip 105 has non-cutting surfaces 107 extending parallel to each other in continuation of the cutting edges 106, of so as to define an opening 105b which serves such air/gas when the tip is inserted into the wall of the tray (see figures 10d and 23). The non-cutting surfaces 107 are displaced axially relative to the distal end of the sharp tip 105, so that upon perforating the side wall of the holder 7, the sharp tip 105 cuts the tab element in the side wall and the non-cut surface helps to propel said flap element in an open position. In the examples of Figures 8a-8c, 9a-9c, 9a'-9c', 11a-11c and 12a-12c, it is the outer side wall of the point 105 that urges the tab member 70a to the open position.
[00162] According to another aspect of the invention, the piercing tool 101 of each piercing unit may be in the form of a tubular needle having at least one internal lumen 108 (usually a lumen needle represents the simplest solution, although not Figure 12a-12c an embodiment of a multi-lumen needle is shown). The lumen and outer surface of the needle may be circular, elliptical or polygonal in cross section: obviously, other conformations may be equivalently suitable. The needle lumen 108 communicates with the point opening 109 which is delimited at least in part by cutting edges 106 and which is connected to said vacuum arrangement 101 in order to draw air from the point opening 109 when the piercing tool is in the operating position.
[00163] Several alternatives can be contemplated depending on whether the piercing tool is in the form of a hollow needle or not.
[00164] As schematically shown in Figure 5i, in case the piercing tool is in the form of a hollow needle, the piercing tool 101 has a suction opening 110 that is axially spaced with respect to the nose opening 109, so defining a tubular tract 111 extending between the suction opening and the tip opening which passes through the passage 532 and through the thickness of the sidewall of the holder 7 when the drilling tool is in the operating position. Note that in case the actuator 104 is carried by the external fixed element 530, there may not be any passage 532 and thus the needle can be fully housed within the internal volume of the element 530.
[00165] Alternatively, in case the piercing tool is not a hollow needle (for example, in case a point as shown in figures 22a-22d or 10d is used) instead of the suction opening 110, the window 105b in the Tip sidewall 105 is used to suck in air, as shown in figures 5k and 23. This solution is particularly advantageous as it is possible to efficiently draw air as pressure drops are minimized. In either case the tip 105 is axially connected to the actuator stem 104.
[00166] From an operating standpoint, air suction can be initiated when the drilling tool has passed through passages 532 (if present), but has not yet pierced the side wall of the support or tray 7. Suction is generated by the arrangement of vacuum 102, for example, comprising a vacuum pump connected to channels 530a and/or 530b conveniently located in the side wall and/or bottom wall of element 530 (see figures 5i, 5j, 5k): this creates a pressure difference between the interior of the support or tray 7 and the volume 300 defined between the base unit 53 and the external surface of the tray or support 7; conveniently, the pressure difference pushes the entire support 7 against the drilling tool(s) with consequent aid in the drilling process. In these embodiments, when the actuator(s) 104 is/are located outside the element 532, the sliding engagement of the drilling units through the respective passages 532 is preferably a tight sliding fit.
[00167] In the attached figures, the perforation unit 100 is carried by the structure and operates in correspondence with the packaging station 201, so as to form one or more holes in the side wall of the support(s) or tray(s ) 7 present(s) at the packing station. Alternatively, the piercing unit 100 may operate in correspondence with a tray holding station 400 (only schematically shown in Figure 1) configured to hold in pre-fixed positions a series of empty holders 7; the tray holding station can be located at or upstream of the charging station: in this case, the perforation unit 100 can be configured to form at least one hole in the side wall of one or more supports 7 located in the tray holding station. tray 400 (in this case the punch unit can be transported by frame 4 or by its own independent frame 401 of the tray 400 holding station).
[00168] According to a further alternative, the perforation unit 100 can operate in correspondence with a tray forming station (not shown) configured to form, for example, from a film, trays or supports 7; the tray forming station can be located at or upstream of the charging station.
[00169] With reference to Figures 5a to 5k, the base unit 53 according to a first variant will be described in detail. According to the first preferred variant, the perforation unit 100 is located in the packing station and the base unit 53 preferably comprises an outer fixed element 530 and an inner slideable element 531. The outer fixed element 530 has a base and a side wall defining a central cavity. The external fixed element 530 is preferably provided with one or more direct passages 532 for slidingly receiving the drilling tool 101 of each drilling unit 100. In particular, the passages 532 are configured to correspond with the position where holes 70 need to be placed. on side walls of a tray supported by the inner slideable element 531 resting on the base of the outer fixed element 530; as mentioned above there may be no need for passages 532 in case the actuator or actuators 104 are transported by element 530 in such a way that the drilling tool is directly emerging into volume 300. Air suction passages 530a and/or 530b can be positioned, for example, on the side wall or bottom wall of the outer fixed element 530, as illustrated in Figures 5i to 5k. The inner surface of the side wall of the outer fixed element 530 preferably is shaped to fit the contour of the holder on which the product to be packaged is disposed. The base of the outer fixed element 530 has a central hole. The outer fixed element 530 is optionally fixed to the frame 10 under the sliding plane 20. The inner slideable element 531 may have a base plate and a rod connected to the fourth piston 54 (not shown in Figures 5a to 5k) and engaging with the central hole of the base of the outer fixed element 530. The inner slideable element 531 is slidable in the central cavity of the outer fixed element 530 by the fourth piston 54 between a first position (shown in Figures 5a, 5b and 5h) in which its plate The base engages the opening 20a of the sliding plane 20 and is substantially aligned with the sliding plane 20 and a second position (shown in Figures 5c to 5g) in which its base plate rests on the base of the outer fixed element 530.
[00170] The operation of the apparatus 1 according to the first mode with the base unit 53 according to the first variant described above will now be described in detail.
[00171] First, the heatable surface 510 of the film transfer plates 51a, 51b is heated to a predetermined temperature. The default temperature is preferably between 190°C and 230°C. The third pistons 52a, 52b with the film transfer plates 51a, 51b are assumed to be initially in the configuration shown in Figure 3, i.e. the third piston 52a has its axis oriented vertically and the third piston 52b has its axis oriented horizontally.
[00172] Then, the film cutting assembly 4 preferably begins to cut the sheets of film 61 from the unwound portion of film 60 which is vertically aligned between the cutting device 40 and the backing block 42. In particular, before of each cut, the second piston 43 preferably pushes the support block 42 in the vertical direction indicated by the double arrow A3 shown in Figure 3, until the support element 422 faces the cutter 40. film winding 60 is pulled until it has a predefined length, preferably corresponding to the length of the tray or supports 7. This can be done by any conventional method such as, for example, by means of an encoder, knowing the angular position of the rotating cylinder 31 and properly controlling its movement to provide the pre-set length of unwound film. When the unwound portion of the film 60 is of a preset length, the first piston 41 preferably pushes the cutter 40 in the horizontal direction indicated by the double arrow A2 of Figure 3, until the cutter 40 rests against the support element 422 and the cutting blade 401 engages the slit 423, thereby cutting a film sheet 61 whose width and length are equal to the width and length, respectively, of the holder 7. After the film sheet 61 has been cut, the first piston 41 preferably pulls the cutter 40 in the horizontal direction indicated by the double arrow A2 of Figure 3, thereby moving the cutter 40 away from the film sheet 61 and the backing member 422. Substantially at the same time, the second piston 43 preferably pulls backing block 42 downwardly in the vertical direction indicated by double arrow A3 shown in Figure 3, until backing plate 421 faces film transfer plate 51b (with the one shown in Figure 3). Substantially at the same time, a vacuum is created through the holes in the backplate 421.
Although the backing block 42 is pulled downwardly, the film sheet 61 is also pulled downwardly, as the vacuum created through the holes in the backing plate 421 keeps the film sheet 61 integral with it. Furthermore, although the backing block 42 is pulled downwardly, the third piston 52b pushes the film transfer plate 51b in the horizontal direction indicated by the double arrow A6 until the film transfer plate 51b rests against the backing plate 421 , with film sheet 61 disposed therebetween.
[00174] Then, vacuum is applied between the heatable surface 510 of the film transfer plate 51b and the film sheet 61 by the vacuum pump through the at least one opening 520 of the film transfer plate 51b, although vacuum through the backplate holes 421 is released. In this way, the film transfer plate 51b retains the film sheet 61 by adhesion, i.e. the film sheet 61 adheres to the heatable surface 510 of the film transfer plate 51b. When the film sheet 61 comes in contact with the heatable surface 510 (which, as mentioned above, is heated to the preset temperature) it advantageously starts to heat up and soften.
[00175] Then, while continuing to apply vacuum between the heatable surface 510 and the film sheet 61, the third piston 52b with its axis horizontally oriented preferably pulls the film transfer plate 51b along the direction indicated by the double arrows A6 of the Figure 3, in order to move it away from the backing plate 421. Due to the vacuum, the film sheet 61 advantageously still adheres to the heatable surface 510.
[00176] During this time, the products 8 to be packaged are arranged on respective supports 7, such as, for example, trays. This can be done, for example, at the charging station 200. Each bracket 7 preferably has a base, a sidewall and an upper rim 7a projecting outwardly from the upper edge of the sidewall. In the example shown in Figures 5a through 5i, the trays or holder 7 do not have holes until they reach the packaging station 201.
[00177] The trays or supports 7 are preferably made of a single-layer or multi-layer thermoplastic material having gas barrier properties. Single-layer gas barrier thermoplastic materials are (co)polyesters, (co)polyamides, and the like. Preferably, in case a multilayer thermoplastic material is used, the multilayer thermoplastic material comprises at least one gas barrier layer and at least one heat sealable layer to allow welding of the film sheet 61 to the surface of the support. 7. Exemplary gas barrier polymers that can be employed for the gas barrier layer are PVDC, EVOH, (co)polyamides, (co)polyesters and mixtures thereof. Preferably, the heat-sealable layer is made of a polyolefin, such as ethylene homo or copolymers, for example, in particular polyethylene, ethylene-[alpha]-olefin copolymers and ethylene-vinyl acetate copolymers, homo or propylene copolymers, such as ethylene-propylene copolymers and ethylene-propylene-[alpha]-olefin terpolymers and ionomers, or homo- or copolyesters, for example, PETG (a glycol-modified polyethylene terephthalate). The multilayer thermoplastic material may also comprise layers of adhesive to better adhere the gas barrier layer to adjacent layers. It can also comprise bulky layers to provide the structure with sufficient thickness and/or the desired mechanical properties. Chemically or physically foamed layers may be present on the support 7 particularly for use as bulk layers. Other layers may also be present - as known in the art - to provide the holder 7 with certain desired properties, e.g. suitable layers to make the final package easy to open or to make it reclosable. The total thickness of the single-layer or multi-layer thermoplastic material is preferably less than 2 mm and, for example, it may be between 0.2 mm and 1.2 mm and even more preferably between 0.3 mm and 1 .0 mm.
[00178] The supports 7, with the products 8 arranged thereon, are then inclined on the sliding plane 20, so that the conveyor belt 21 makes them slide, for example, step by step along the sliding plane 20 in the indicated direction. by arrow A1 of Figure 1a on the loading station 200 towards the packaging station 201. As shown in Figure 5a, one of the supports 7 with a product 8 disposed thereon is sliding step by step along the sliding plane 20 under the effect of the conveyor belt 21 (not shown in Figure 5a), until it reaches the opening 20a engaged by the base unit 53 and, consequently, is disposed on the base plate of the inner slideable element 531.
[00179] Although the conveyor belt 21 is carrying the support 7 on the base plate of the inner slider 531, the rotating cylinder 50 preferably rotates 180° around its X axis, so that the positions of the transfer plates film 51a, 51b are switched. Therefore, the third piston 52b now has its axis oriented vertically and the film transfer plate 51b holding the film sheet 61 is now above the support 7 and the product 8 (see Figure 5b). Vacuum applied between the heatable surface 510 of the film transfer plate 51b and the film sheet 61 is symbolically represented by arrow A8.
[00180] The inner slideable element 531 is then moved downwardly by the fourth piston 54 in the vertical direction indicated by arrow A7 of Figure 3, until its lower part rests on the base of the outer fixed element 530 (see figure 5c).
[00181] Then, while continuing to apply vacuum between the heatable surface 510 and the film sheet 61, the third piston 52 pushes downwardly the film transfer plate 51b (which in this case represents the upper retainer member 103) along from the vertical direction indicated by arrow A5 of Figure 3, until the heatable surface 510 engages the bracket ring 7 carried by the external fixed element 530 of the base unit 53 and the film sheet 61 covers the bracket opening 7, as shown in Figure 5d. Preferably, the edges of the film sheet 61 are fixed to the rim of the support 7 in an airtight manner by the pressure of the film transfer plate 51b.
[00182] Then, vacuum or a low pressure state is created in volume 300 between the inner surface of the element 53 and the outer surface of the support or tray 7, actuating the suction pump 102 which - via openings 530a, 530b. Substantially at the same time or thereafter, the drilling unit 100 (or units) is activated to move the drilling tool 101 from the rest position to the operating position, creating at least one through hole 70 in said support side wall, of that mode forming a passage by placing the interior of the support or tray 7 in fluid communication with the volume 300 and thereby with the vacuum pump 102; it should be noted that if the tip is in the form of a needle, suction from the interior of the tray or holder 7 takes place through the needle cavity via suction opening 110 and pump 102; in the case where the tip is not hollow (figures 10d and 23) the suction from inside the tray or support 7 takes place through the tip window 105b. As mentioned, air suction through passages 530a and/or 530b can be initiated when the drilling tool has not yet pierced the side wall of the holder or tray 7 (see figure 5i): this condition creates a pressure difference between the interior of the support or tray 7 and the volume 300 defined between the base unit 53 and the outer surface of the tray or support 7; the pressure difference acts as a contrast pushing the entire support against the inner surface of the base unit and against the drilling tool(s) with consequent aid in the drilling process. In a second stage, the drilling tool progressively pierced the side wall of the tray or support forming a flap element, as shown in Figures 13 to 15. Note that, in the case of a plurality of drilling units, said units can be controlled synchronously in order to simultaneously perforate the side wall of the support or tray 7 in respective different places. A single actuator 104 can be used to move a plurality, for example all, of drilling units 101.
[00183] Once the drilling tool has created the hole or holes 70 and has reached its operating position, air is removed from inside the support or tray 7 by means of the vacuum pump 102, through the newly created holes 70 and the lumens 108 and opening 110 or via windows 105b, as schematically indicated by arrows A9 in Figure 5e. This advantageously creates a vacuum (i.e. lowers the pressure) within the support 7 under the film sheet 61. It can be noted that even if a vacuum is created under the film sheet 61, the film sheet 61 may still adhere to the heatable surface 510. This is due to the fact that the low pressure created between the heatable surface 510 and the film sheet 61 is lower than the low pressure created under the film sheet 61.
[00184] After a predefined low pressure is reached within the support 7 under the film sheet 61 (typically in the range of up to 50 mBar, preferably between 3 and 40 mBar, more preferably between 5 and 30 mBar and still of more preferably in the range of 10-20 mBar), air is reintroduced between the heatable surface 510 and the film sheet 61 through at least one opening 520 of the film transfer plate 51b, as indicated by arrow A8 of Figure 5f. Air can be reintroduced either immediately after the preset low pressure is reached or after a preset extra time. Alternatively, air is reintroduced when a preset time has expired (typically between 0.5 and 2.5 s and preferably between 1 and 2 s). The film sheet 61 then no longer adheres to the heatable surface 510 and is pulled downwardly by the vacuum within the support 7. Although the film sheet 61 is pulled downwardly, the vacuum pump preferably continues to remove air from the support 7 through the holes 70. Advantageously, the film sheet 61 moving downwardly on the holder 7 helps the air to exit the holder 7 through the holes 70. Since the film sheet 61 is heated (and then softened) under the effect of the vacuum inside the support 7 it deforms so as to adhere to the product 8 and the inner surface of the support 7, as shown in Figure 5f. The removal of air from inside the holder 7 advantageously can continue until the holes 70 are closed by the film sheet 61. Note that in order for the film sheet to close the holes, the punching tool is retracted in the position shown in Figure 5f where the sharp tip is housed in passages 532 or at least in a position where the sharp tip is not protruding from the inner surface of the holder or tray 7. As soon as the film sheet 61 closes the holes 70 adhering to the inner surface of the holder 7 , also bringing the flap elements for closing the respective holes, the removal of air from inside the support 7 is prevented. When the removal of air from inside the support 7 is prevented, the evacuation of the package ends.
[00185] The film transfer plate 51b is then pulled in the vertical direction indicated by arrow A5 of Figure 3 by the third piston 52b, thereby moving it away from the base unit 53 (see Figure 5g).
[00186] Vacuum is released under the support 7 and then the fourth piston 54 preferably pushes the inner slideable element 531 of the base unit 53 in the vertical direction indicated by arrow A7 of Figure 3, until the inner slideable element 531 is again substantially aligned with the sliding plane 20 (see Figure 5h). In this way, the support 7 can continue to slide step by step along the sliding plane 20 in the horizontal direction indicated by arrow A1 under the effect of the conveyor belt 21.
[00187] The operation of a single film transfer plate 51b has been taken into account in the above description because the apparatus 1 may include a single transfer plate. Indeed, in a possible variant, the apparatus 1 of Figures 1 to 4 can include a single transfer plate. In this case, the apparatus would have less performance compared to a solution like that of Figures 1 to 4, in which the single transfer plate for a first period of time would have to cooperate with the unwound portion of film 60 in order to separate a portion. of film preset and for a second period of time with the base unit 53 in order to seal the film and allow air evacuation. Furthermore, the structure and functioning of apparatus 1 would not change significantly.
[00188] However, in the apparatus 1 of Figures 1 to 4 two film transfer plates 51a, 51b are operated simultaneously. Its operation is preferably synchronized as follows.
[00189] Although the film transfer plate 51b is involved in the operations of Figures 5d to 5f (ie is in contact with the base unit 53), the film cutter assembly 4 cuts an additional sheet of film as described above (support block 42 is pushed upwards until support member 422 faces cutter 40, cutter 40 is pushed horizontally against support member 422, thus cutting the film sheet further, the cutter 40 is moved away from the bearing element 422 and the bearing block 42 is pulled downwardly until the bearing plate 421 faces the film transfer plate 51a, the film transfer plate 51a is pushed against the plate. of backing 421 with the additional film sheet disposed therebetween, vacuum is applied between the heatable surface of the film transfer plate 51a and the additional film sheet so that the film transfer plate 51a retains the film sheet. The additional film transfer plate 51a retaining the additional film sheet is moved away from the backing plate 421. Successively, the film transfer plate 51b is preferably moved away from the base unit 53 (Figure 5g) and the support 7 is raised to the level of the sliding plane 20 (Figure 5h). So, for example, with a single step of the stepping motor unit 22, the conveyor belt 21 removes the support 7 from the base unit 53 and brings an additional support with an additional product on the inner slide element 531 of the base unit. 53. The additional support is brought on the inner slideable element 531 and said element 531 is lowered, while the rotating cylinder 50 preferably rotates by an angle of about 180° around its X axis, thereby exchanging the positions of the plates transfer film 51a, 51b. The heating surface 510 is then lowered to engage the collar of the support 7 carried by the outer fixed element 530 of the base unit 53. Consequently, the film transfer plate 51a holding the additional film sheet is now above the additional support or tray 7 and acts as the upper unit of retainer 103. The operations shown in Figures 5d to 5h are then repeated to provide an additional product packaged according to the vacuum bag packaging technique.
[00190] The operation of the apparatus 1 repeats cyclically according to the above timing, thereby implementing vacuum bag packaging on a series of supports 7 with respective products 8 loaded on them that are sequentially provided in the sliding plane 20.
[00191] The machine described above has a number of advantages.
[00192] First of all, providing the holes 70 in the holder 7 advantageously allows to remove air from within the holder 7 under the film sheet 61, even after the film 61 is brought into airtight contact with the holder rims 7. This advantageously allows to remove more air from inside the support 7, thereby minimizing the amount of residual air left in the support 7 at the end of the vacuum packaging process and, consequently, minimizing the risk of air pocket formation. Furthermore, the air suction via the holes 70 and each of the windows 105b or suction openings 110 results in a very efficient evacuation process because the newly created hole perfectly fits the shape of the drilling tool and suction can be exerted. directly or in close proximity to the internal volume of the stand or tray when needed. Also, the described apparatus allows to create an ideal vacuum condition in the volume 300, even before the actual formation of the holes 70 and, furthermore, the removal of air from the support 7 is made possible even after the film sheet 61 is released from the heatable surface 510 of film transfer plate 51b. This advantageously allows to efficiently carry out the perforation step and to reduce the residual amount of air inside the package at the end of the vacuum bag packaging process. Furthermore, at the end of the process, the flap elements are brought back into alignment with the respective side wall providing the package with appreciable continuity on the outer surface of the tray or support 7. Additionally, the use of a flap that remains part integral part of the tray does not result in any scratches of plastic inside the package, thus minimizing contamination risks.
[00193] Furthermore, the perforation unit can easily be implemented in existing apparatus, thereby avoiding the need to have pre-drilled trays.
[00194] According to a second variant of the first embodiment, the base unit 53' preferably comprises an external element 530', a fixed base plate 531' and an adapter 534' with, for example, four feet leveling height 533'. The fixed baseplate 531' is connected to a fixed rod 540 of the third piston 54 and has four through holes (not visible in the drawings). Adapter 534' slopes onto the fixed baseplate 531' with the four leveling feet 533' engaging the through holes and protruding from the underside of the fixed baseplate 531'. In an alternative variant not shown in the drawings, the adapter 534' can be configured so that when it leans on the fixed base plate 531', the four leveling feet 533' are external to the fixed base plate 531' and they protrude from the underside of the 531' fixed baseplate. Fixed base plate 531' and adapter 534' engage opening 20a of sliding plane 20 so that the upper surface of adapter 534' is aligned with sliding plane 20. Outer member 530' has a base and a wall lateral defining a central cavity. As in the embodiment described above, depending on the location of the actuator(s) 104, the base may or may not have one or more suitable passages for receiving drilling tools from the drilling units 100. As described for the variant of the figures 5a to 5k, each drilling unit has a drilling tool 101 operable between a rest position, where tool 101 is spaced from the side wall of said holder or tray 7, and an operating position, where tool 101 acts on said support 7 and forms at least one through hole 70 in said side wall. In more detail, the or each drilling unit 100 comprises an actuator 104 (which may be a pneumatic piston, a hydraulic piston or an electric actuator or other type of actuator) connected to the drilling tool 101 and configured to move the tool perforation 101 according to a prefixed perforation direction DP intersecting the side wall of said support 7 when the latter is locked in position by base unit 53' and plate 51a, 51b. Alternatively, a single actuator can be used to move a plurality of drilling units.
[00195] Note that although, for example, Figure 6e shows a drilling tool moving horizontally, each drilling unit can also be configured to move the drilling tool vertically, as shown in Figure 5j: note that in this case the punching tool can pierce a horizontal edge formed by the side wall of the tray or support vertically from the upper rim of the support or tray.
[00196] In case the actuator(s) 104 are located externally to the external element 530', the latter can be provided with one or more through passages 532' for slidingly receiving the drilling tool 101 of each perforation unit 100. They can be positioned, for example, on the underside (not shown in the figures) of the outer fixed element 530' or, as illustrated in Figure 6e, on the sidewall thickness of the outer element 530' in correspondence. with an upper portion of the side wall of the tray or support 7. In particular, passageways 532' are configured to correspond with the position where holes 70 need to be placed in the side walls of a tray.
[00197] Possible conformations of the drilling tool according to aspects of the invention are shown in Figures 8a-8c, 9a-9c, 9a'-9c' 10a-10d, 11a-11c, 12a-12c and 22a-22d and are not further described, as a corresponding detailed description has already been provided in this document above with reference to the first variant.
[00198] The central cavity of the outer element 530' is preferably sized to allow the fixed base plate 531' and adapter 534' to slide into the central cavity. The base of the outer element 530' is preferably connected to a movable cylinder 541 of the third piston 54.
[00199] The operation of the apparatus 1 with the base unit 53' according to the second variant will now be described in detail. Since the operations not involving the base unit 53' are substantially the same as the corresponding operations performed by the machine with the base unit 53 according to the first variant, such operations will only be briefly summarized, as a detailed description of the same will not be repeated.
[00200] First, the heatable surface 510 of the film transfer plates 51a, 51b is heated to a predetermined temperature. Then, the film cutting assembly 4 preferably begins to cut sheets of film 61 from the unwound portion of the film 60 as described above (prior to each cut, the backing block 42 is pushed upwards until the backing member 422 turns over. for the cutter 40, the cutter 40 is pushed horizontally against the support member 422, thus, by cutting a sheet of film 61, the cutter 40 is moved away from the support member 422 and the support block 42 is pulled downward until backplate 421 faces film transfer plate 51b). Then, the film transfer plate 51b is pushed against the backing plate 421 with the film sheet 61 disposed therebetween, vacuum is applied between the heatable surface of the film transfer plate 51b and the film sheet 61, of so that the film transfer plate 51b retains the film sheet 61 and the film transfer plate 51a retains the film sheet 61 is moved away from the backing plate 421.
[00201] Meanwhile, the products 8 to be packaged are arranged on the respective supports 7. The supports 7, with the products 8 arranged thereon are then inclined on the sliding plane 20, so that the conveyor belt 21 makes them slide , for example, step by step along the sliding plane 20 in the direction indicated by arrow A1 in Figure 1a.
[00202] As shown in Figure 6a, one of the supports 7 with a product disposed on it (not visible in Figure 6a) is sliding along the sliding plane 20 under the effect of the conveyor belt 21 (not shown in Figure 6a) until it reaches opening 20a is engaged by base unit 53' and will be correspondingly disposed on adapter 534'.
[00203] Although the conveyor belt 21 is carrying the holder 7 on the adapter 534', the rotating cylinder 50 preferably rotates 180° around its X axis, so that the positions of the film transfer plates 51a, 51b are exchanged. Therefore, the third piston 52b now has its axis oriented vertically and the film transfer plate 51b holding the film sheet 61 is now above the support 7 and the product 8 (see Figure 6b). The outer element 530' is then moved upwardly in the vertical direction indicated by arrow A7 of Figure 3 by the moving cylinder 541 of the fourth piston 54, until the outer element 530' touches the support ring 7 and the leveling feet 533' of the adapter 534' rest on the base of the outer member 530' (see Figure 6c).
[00204] Then, the outer element 530' is further moved upwards in the vertical direction indicated by arrow A7 of Figure 3 by the moving cylinder 541 of the fourth piston 54, thus raising the adapter 534' (and the support 7 resting thereon) and detaching -o of the fixed base plate 531'. The stroke of the outer element 530' ends when the fixed base plate 531' leans against the base of the outer element 530' (see Figure 6d).
[00205] Then, the film transfer plate 51b holding the film sheet 61 is pushed downwardly until the film sheet 61 covers the opening of the holder 7 (as shown in Figure 6e), the edges of the film sheet 61 being fixed to the frame of the support 7 in an air-tight manner.
[00206] Then, vacuum or a low pressure state is created in volume 300' between the inner surface of the element 53' and the outer surface of the support or tray 7, actuating the suction pump 102 via openings 530a', 530b'. Substantially at the same time or thereafter, the drilling unit 100 (or units) is activated to move the drilling tool 101 from the rest position to the operating position, creating at least one through hole 70 in said supporting side wall, of that mode forming a passage by placing the interior of the support or tray 7 in fluid communication with the volume 300' and thereby with the vacuum pump 102; it should be noted that if the tip is in the form of a needle, suction from the interior of the tray or holder 7 takes place through the needle cavity via suction opening 110 and pump 102; in the case where the tip is not hollow (figures 10d and 23) the suction from inside the tray or support 7 takes place through the tip window 105b. As mentioned, air suction through passages 530a' and/or 530b' can be initiated when the drilling tool has not yet pierced the side wall of the holder or tray 7: this condition creates a pressure difference between the interior of the holder or tray 7 and the volume 300' defined between the base unit 53 and the outer surface of the tray or support 7; the pressure difference acts as a contrast pushing the entire support against the inner surface of the base unit and against the drilling tool(s) with consequent aid in the drilling process. In a second stage, the drilling tool progressively pierced the side wall of the tray or support forming a flap element, as shown in Figures 13 to 15. Note that, in the case of a plurality of drilling units, said units can be synchronously controlled in order to simultaneously perforate the side wall of the support or tray 7 in respective distinct locations. A single actuator 104 can be used to move a plurality, for example all, of drilling units 101.
[00207] Once the drilling tool has created the hole or holes 70 and has reached its operating position, air is removed from inside the support or tray 7 by means of the vacuum pump 102, through the newly created holes 70 and the lumens 108 and opening 110 or via windows 105b.
[00208] Following re-venting through the film transfer plate 51b, the film transfer plate 51b is pulled in the vertical direction indicated by arrow A5 of Figure 3 by the third piston 52b, thereby moving it away from the unit. of base 53 (see Figure 6f) and vacuum in outer element 530' is released.
[00209] Then, the outer element 530' is moved downwardly in the vertical direction indicated by arrow A7 of Figure 3 by the moving cylinder 541 of the fourth piston 54, thus lowering the adapter 534' (and the support 7 resting thereon) and bringing it again in contact with the fixed base plate 531' (see Figure 6g).
[00210] The outer element 530' is then further moved downwardly in the vertical direction indicated by arrow A7 of Figure 3 by the moving cylinder 541 of the fourth piston 54, until the outer element 530' disengages from the opening 20a of the sliding plane 20 and from support 7 (see Figure 6h). In this way, the support 7 can continue to slide along the sliding plane 20 in the horizontal direction indicated by arrow A1 under the effect of the conveyor belt 21.
[00211] Also according to this second variant, the two film transfer plates 51a, 51b can be operated according to the timing described above, or alternatively the apparatus can include a single transfer plate 51a.
[00212] As an additional variant of the first modality, instead of a continuous film of the appropriate width which is cut into film sheets of the predefined length corresponding to the mouth of the tray, it is also possible to use precut film sheets of the proper dimensions (width and length and shape). Said precut film sheets can be stacked and taken up, one at a time, by the film transfer plate, or plates, 51a and 51b and used in the packaging process described above. In that case, an appropriate configuration of the packaging assembly 5 (not shown in the drawings) can provide that the film transfer plate, or plates, 51a, 51b are arranged parallel to the base unit 53 and they are moved vertically by relative pistons that allow said film transfer plate, or plates, 51a, 51b to be raised and lowered as required. In case the apparatus includes two plates, the pistons can be connected to a cylinder rotating about a vertical axis so as to horizontally displace the pistons with the film transfer plates 51a, 51b. This alternative packaging assembly can perform the following steps: lower a first film transfer plate (designed 51a above) onto the stack of precut film sheets, apply vacuum through the first film transfer plate 51a to absorb the top film sheet of the stack, lifting the first film transfer plate 51a with the precut film sheet adhered thereto, rotating the cylinder by a suitable angle to bring said first film transfer plate 51a over a unit of base 53 and at the same time a second film transfer plate 51b above the stack of precut film sheets and lowering the first film transfer plate 51a to carry out a vacuum bag packaging process as described above. Drilling units would be located and operate as described above. Second mode of device 1
[00213] According to a further variant of the invention, the apparatus 1 may be of the type disclosed in Figure 7. Figure 7 schematically shows an apparatus 1 having a structure 601. Material in the form of a plastic web (thermoformable film) is unwound from the spool 602 carried by the frame 601 or by a frame associated with the frame 601 and moved to a forming die 603. The plastic material is heated in the forming die and formed into trays 7. The formed trays 7 are loaded manually or automatically with a product and then transferred by a transport assembly 604 to a packaging station 605 where a packaging assembly 606 is transported by the frame fixedly to a sheet of film 61 (cover film) which is unwound from the supply roll of film 607: the film sheet 61 covers the full trays 7. Note that the transport assembly 604 can include a conveyor and a sliding plane as described for the example of Figures 1-4. At the packaging station, a keeper 103 of the packaging station 606 holds the tray 7 in the proper position. The keeper 103 may have a base unit 53 of the type shown in Figures 5a to 5i and an upper unit 51 comprising a heating plate. The base unit and the top unit can be relatively displaceable in a vertical direction in order to sandwich and block a horizontal rim of the tray and a portion of the film sheet, as shown in Figure 5i. The packaging assembly holds the tray 7 in position and allows application of the film sheet unwound from the reel 602. At least one perforation unit 100 having a perforation tool 101 operable between a rest position, where the tool 101 is spaced apart from the side wall of said support 7, and an operating position, where tool 101 acts on said support 7 and forms at least one through hole 70 in said side wall, while the tray is held in position in the packaging station. The drilling unit may be of the type described above with reference again to Figures 5a to 5i and the description thereof. Air is evacuated from the tray, for example, via a lumen provided in each of the drilling tools. Then, or contemporaneously, the package is sealed. Downstream from the packaging station there may be a cutting unit 608 separating the trays from each other. Device control unit 1
[00214] The apparatus according to the invention has at least one control unit.
[00215] The control unit 120 (shown schematically in Figure 1) is at least connected to the transport set 2, the packaging set 5, the perforation unit 100 and the vacuum arrangement 101 and is configured to command the set of transport 2 for moving said support 7 along the predefined path, for example controlling the motor 22 according to a step-by-step movement; the control unit also controls the packaging assembly 5 and thus all the actuators described above in order to sealingly fix the film sheet 61 to said support 7 when the latter has reached the packaging station; in addition, the control unit commands the drilling unit, or units, 100 to move the drilling tool 101 from the rest position to the operating position (and vice versa, once the desired vacuum level is reached) thereby creating at least one through hole 70 in said support side wall; furthermore, the control unit is connected and controls the vacuum arrangement (vacuum pump 102) to remove air from inside said holder 7 under said film sheet 61 through at least said one hole 70. The above actions they are carried out by the control unit with the help of sensors that are known per se and therefore are no longer described. For example, with the aid of position sensors the control unit 120 can determine when the support 7 is positioned on the base unit 53 of the packaging assembly 5 and command the displacement of the drilling tool 101 from the rest position to the position of operation only after the holder 7 is correctly positioned on the base unit 53. The control unit can also be configured to determine when the drilling tool 101 has reached the operating position and thus synchronize the command to the vacuum disposition 102 remove air from within said support 7 according to the sequence described above for the various alternative embodiments. As explained in the above description the vacuum pump 102 is preferably activated also before the piercing units have actually pierced the support wall.
[00216] The control unit may comprise a digital processor (CPU) with memory (or memories), an analog type circuit or a combination of one or more digital processing units with one or more analog processing circuits. In the present description and in the claims it is indicated that the control unit is "configured" or "programmed" to carry out certain steps: this can be achieved in practice by any means allowing to configure or program the control unit. For example, in the case of a control unit comprising one or more CPUs, one or more programs are stored in a suitable memory: the program or programs containing instructions which, when executed by the control unit, cause the control unit to execute the steps described and/or claimed in connection with the control unit. Alternatively, if the control unit is of an analog type, then the control unit circuits are designed to include circuits configured, in use, to process electrical signals in order to carry out the control unit steps disclosed herein. The vacuum bag package
[00217] The apparatus and processes described above may be suitable for making a vacuum bag package hosting at least one product as described in this section and as claimed in any of the appended claims relating to a 'vacuum bag package'. An example of this type of package is shown in Figures 20. This package can be obtained using any of the trays or supports of the type described above, for example, the trays shown in Figures 13 to 20.
[00218] The innovative vacuum bag package 700 comprises a tray 701 featuring a bottom wall 702 which may be circular, oval or polygonal optionally rectangular in shape and a side wall 703 extending upwardly from the bottom wall and having a rim upper 704 which is externally directed and serves as a stop for a sealing film 705. The side wall has at least one cutout 70 which basically defines a passage or hole in the side wall of the tray, with a correspondingly associated flap element 70a, which is connected to the side wall of the tray: in particular, prior to application of the film 705, the flap element 70a is positionable at least in an open position, where the flap element is inclined relative to the wall of the tray (see dashed line in figure 20) and leaves a hole 70 in the sidewall (either in the horizontal or vertical or slanted positions of the sidewall) to allow fluid to pass therethrough. The flap element can also be positioned in a closed position, where the flap element is aligned with the side wall of the tray and substantially closes said hole. One or more products 706 are loaded into the tray and the film 705 is draped over the product(s) and welded to the upper rim 704 and an inner surface portion of the tray. As shown in Figure 20 a portion of the film holds the flap member 70a in the closed position and sealingly closes at least one hole in the side wall; in the closed position, the flap element 70a is perfectly level with the outer surface of the sidewall, thereby improving the aesthetic appearance of the package. In the example of Figure 20 the flap element 70a is integral with the side wall and delimited by an open cut line 70b, for example obtained using the perforation unit 100 of the apparatus 1 described above; tab element 70a is connected to the side wall by a hinge line 70c (shown in dashed line in the figures) extending between ends of said cut line: in practice, tab element 70a is a cut-out portion of the side wall 703 which remains connected to and integral with the sidewall via hinge line 70c which defines a bending line around which the flap element can rotate and move between said open and closed positions. The open cut line 70b typically takes a regular shape, such as that of a polygonal line or an arc, for example, arc of a circle or ellipse arc or combination of segments and arcs. For best operation of the flap element, the flap element must meet certain geometric requirements: the length of the hinge line 'l' is not greater than the maximum width 'w' of the flap element, measured parallel to the hinge line (See, for example, Figures 21a and 21b which represent enlarged views of areas of the sidewall intercepted by the flap element). In figures 21b, 21c, 21d, 'l' and 'w' are basically of the same length. In any case, the hinge line 'l' which is always less than or equal to 'w' may not be too small compared to 'w': for example, 'l' must not be less than 0.2 (1 /5) of 'w'. Furthermore, the height 'h' of the flap element - measured perpendicular to the hinge line (see again figures, for example 21a and 21b) is preferably greater than 0.2 (1/5), optionally greater than 0, 5 (1/2) of the length 'l', but preferably less than 3 times 'l'. The above relative proportions can prevent excessive and uncontrolled curling of the flap element and at the same time ensure the flap element's ability to return in the closed position.
[00219] As mentioned, the upwardly sidewall ends in an externally projecting horizontal rim 704, with the film sheet 61 being welded to the upper surface of said horizontal rim and to at least a portion of the inner surface of the sidewall (see of figure 20), in order to stably keep the flap element in the closed position and ensure perfect watertightness in the correspondence of the holes 70.
[00220] Furthermore, according to another aspect, the hole(s) is/are located in correspondence with the corner(s) of the side wall, when the latter have a polygonal base. The sidewall 703 may comprise one or more horizontal edges 707 preferably present in the upper half of the sidewall area: in this case, each horizontal edge 707 may be located in correspondence with a respective one of said corners. In the example of Figures 16-19b, each of said horizontal edges 707 is substantially shaped like a right triangle when viewed from a top view; furthermore, the side wall has vertical and mutually perpendicular facets emerging from orthogonal converging edges of each of said horizontal edges, so as to define a region having 3 mutually converging perpendicular surfaces located in the corner regions where one or more of said holes and corresponding flap elements can be conveniently located. In particular, each hole may be located in correspondence with a respective corner in the form of an opening through the portion of the side wall defining the horizontal edge or one of said vertical facets.
[00221] In one embodiment, on an inner edge of each horizontal edge, i.e. on the side of the horizontal edge facing inwards of the tray, the side wall of the tray may also have a protective bulge 709, such as a substantially directed rim up; as is, for example, visible from Figure 19b each horizontal edge 707 is positioned vertically at a lower height compared to said outwardly projecting horizontal rim 704 (which is the upper rim of the tray) and extends horizontally between said protrusion 709 and an additional sidewall portion extending from the horizontal edge and ending in said horizontal rim. In this way, the horizontal edges can be positioned in a relatively lower area of the sidewall while keeping the edges free from contamination from the product thanks to the bulge of the shield. Note that the just-described appearance involving the protective bulge 709 and the corresponding horizontal edge 707 is independent of the shape (when viewed from a top view) of the horizontal edge and may also be present in cases where the corner is not forming three facets such as described above and/or is not defining a triangular edge 707.
[00222] Furthermore, as shown in Figures 17a, 17b, 18a, 18b, 19a, 19b the horizontal edges 707 can be positioned vertically either at the same height or closer to the bottom of the tray compared to the position of additional horizontal features 708 (also preferably located in corner regions) serving as abutments during tray stacking (also referred to as the nesting feature).
[00223] Although the invention has been described in connection with what is currently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but rather is intended to cover various modifications and equivalent provisions included within the spirit and scope of the appended claims.

权利要求:
Claims (18)
[0001]
1. Apparatus (1) for packaging a product (8) arranged on a support (7), said support (7) having a base wall and side wall, said apparatus (1) characterized in that it comprises: a structure (10); a transport assembly (2) disposed on the frame (2) and configured to move one or more supports (7) along a predefined path; a packaging assembly (5) carried by said frame (10) and operative at a packaging station (201) positioned along said path, the packaging assembly (5) being configured to sealingly secure a film sheet ( 61) to said one or more supports (7); wherein the packaging assembly (5) comprises a base unit (53) configured to receive and hold the support (7), and a top unit operating above the base unit (53) and configured to position the film sheet (61) above the base unit (53); at least one drilling unit (100) having a drilling tool (101) operable between a rest position, where the tool (101) is moved away from the side wall of said support (7), and an operating position, where the tool (101) acts on said support (7) and forms at least one through hole (70) in said side wall; and a vacuum arrangement (102) configured to remove air from within said support (7) beneath said sheet of film (61) at least in part through said at least one hole (70); wherein the piercing tool (101) of each piercing unit (100) defines a nose opening (109) connected to a suction opening (101, 105b) spaced from the nose opening and in fluid communication therewith. vacuum arrangement (102) in order to remove air from within said support (7) when the piercing tool tip (105) is inserted into the at least one hole (70); and wherein the base unit (53) defines a chamber configured for housing said at least one support (7) and has passages (530a, 530b, 530a', 530b'), either in its side wall or in its wall designed to position, in fluid communication, the vacuum arrangement (102) and a volume (300, 300') defined at least between an outer surface of the support (7) and an inner surface of the base unit (53) .
[0002]
2. Apparatus according to claim 1, characterized in that it further comprises: - a retainer (103) configured to maintain the support (7) in a predetermined position at least during drilling, - at least one actuator (104 ) connected to at least one respective drilling tool (101) and configured to move the drilling tool (101) according to a pre-fixed drilling direction (DP) intersecting the side wall of said support (7) when the latter is placed in said predetermined position.
[0003]
3. Apparatus according to claim 1 or 2, characterized in that said drilling tool (101) has a pointed tip (105) configured to progressively contact the side wall of the support (7) upon displacement of the drilling tool. perforation (101) from the rest position to the operating position, wherein the sharp tip (105) has one or more cutting edges (106), each of said cutting edges (106) being positioned on the sharp tip (105) of in order to define a side profile which is inclined with respect to a pre-fixed direction of perforation (DP), said cutting edges (106) being positioned and configured so that by perforating the side wall of the support (7) , the pointed tip (105) cuts a flap element in the side wall, optionally, wherein the drilling tool (101) has an elongated shape along a predominant longitudinal axis (101a) and the lateral profile. The angle of the cutting edge is inclined by an acute angle (α) with respect to said longitudinal axis of the drilling tool.
[0004]
Apparatus according to any one of the preceding claims, characterized in that said sharp tip (105) of the drilling tool (101) comprises two cutting edges (106) having distal portions (106a) converging to form a geometry V-shaped at a distal end of the tip (105), the two distal portions (106a) being angled by an angle (α) with respect to a longitudinal axis (110a) of the drilling tool (101), wherein the edges cuttings include two additional portions (106b), adjacent and following the distal portions (106a), the additional portions (106b) terminating in non-cutting surfaces (107) which extend toward a proximal end of the tip (105) and delimit an opening (105b), wherein additional portions (106b) of the cutting edges (106), optionally arc-shaped, converge to define non-cutting surfaces (107) extending at a distance (d) from each other which is smaller than the maximum distance (w) between the cutting edges (106), so that by perforating the side wall of the support (7), the pointed tip (105) cuts a flap element (70a) in the side wall and the non-cutting surfaces (107) impel said flap element in an open position, surface portions (107) defining an opening (105b) of sufficient size to allow suction of air/gas coming from within the support (7).
[0005]
5. Apparatus according to any one of the preceding claims, characterized in that the structure (10) defines a sliding plane (20) for the support (7) and in which the transport assembly (2) comprises a conveyor ( 21) having at least one portion positioned above the sliding plane (20) and configured to move the support (7) above the sliding plane (20) and along said path of a charging station (200), where one or more supports are received by the conveyor, to the packaging station (201), where at least one support (7) can be positioned and where each perforation unit (100) is transported by the structure and operates in correspondence with the packaging station, the perforation unit (100) being configured to form at least one hole in the side wall of at least one support present in the packaging station.
[0006]
6. Apparatus according to any one of the preceding claims, characterized in that it comprises a control unit (120) connected to the transport assembly (2), to the packaging assembly (5), to the perforation unit (100) and to the vacuum arrangement (101), said control unit being configured to: command the transport assembly (2) to move said support (7) along the predefined path; commanding the packaging assembly (5) to sealingly secure the film sheet (61) to said support (7) when the latter has reached the packaging station; commanding the drilling unit (100) to move the drilling tool (101) from the rest position to the operating position, thereby creating at least one through hole (70) in said support side wall; and commanding the vacuum arrangement (102) to remove air from within said support (7) under said sheet of film (61) through at least one hole (70), wherein the control unit (120) is further configured to: determine when the drilling tool (101) has reached the operating position and command the vacuum arrangement (102) to remove air from within said support (7), while keeping the drilling tool (101) in said position of operation; or, alternatively, wherein the control unit (120) is further configured to: command the vacuum arrangement (102) to remove air from the volume (300; 300') defined between the base unit (53) and the outer surface of the support (7) before the drilling tool (101) has started to create at least one said hole, so that a pressure difference is defined between the interior of the support or tray (7) and the volume (300; 300 ') and, subsequently or contemporaneously, commanding the displacement of the drilling tool (101) to the operating position by progressively piercing the side wall of the support, continuing to command the vacuum arrangement (102) to remove air from inside said support ( 7), while maintaining the drilling tool (101) in said operating position.
[0007]
7. Method for vacuum bag packaging of at least one product (8) arranged in a holder (7), the method using the apparatus as defined in any one of claims 1 to 6, said method characterized by the fact that comprises: providing a sheet of film (61) above said at least one support (7) with said product (8) being disposed between the support and the sheet of film (61); sealingly attaching said sheet of film (61) to said support (7); drilling a wall of the support to form at least one through hole (70); removing at least a portion of air from within said support (7) under said sheet of film (61) through said at least one hole (70).
[0008]
8. Method according to claim 7, characterized in that it comprises moving the support (7) above a sliding plane (20) and along a predefined path from a support loading station (200) to the packaging station (201), where the support housing the product is provided with said airtightly attached film sheet (61), wherein the perforation step occurs when the support is in the packaging station, and in which the drilling step comprises the following substeps: moving the drilling tool (101) according to a pre-fixed direction intersecting the side wall of said support (7); and progressively contacting the outer surface of the sidewall with the piercing tool (101) and forming a tab element (70a) connected to the sidewall of the support (7).
[0009]
9. Method according to any one of the preceding claims 7 to 8, characterized in that the step of removing air comprises: removing air from the volume (300; 300') defined between the base unit (53) receiving the support (7) and the outer surface of the support (7) before the drilling tool (101) has started to create at least one said hole, so that a pressure difference is defined between the interior of the support (7) and the volume (300; 300') and subsequently or contemporaneously command the displacement of the drilling tool (101) to the operating position to progressively pierce the support side wall, continue to remove air from inside said support (7), while keeping the drilling tool (101) in said operating position.
[0010]
10. Method according to any one of the preceding claims from 7 to 9, characterized in that the step of airtightly securing said sheet of film (61) to said support (7) comprises: locking a ring of the support (7) and a corresponding portion of the film sheet (61) between a heated surface of an upper unit (51; 51a, 51b) and an abutment surface of a base unit (53), retaining the support (7 ) so that the support ring (7) and the corresponding portion of the film sheet (61) are in mutual contact, wherein the perforation step takes place before, during or after said blocking step.
[0011]
11. Method according to claim 8, characterized in that said step of removing air further comprises waiting until a preset period of time from the initiation of the air removal step has elapsed or a preset pressure has been reached within the said holder (7) under said sheet of film (61), the method comprising the further steps of: extracting the drilling tool (101) from said hole (70), and aligning the tab element (70a) with the wall laterally, so as to substantially close said hole with the film sheet (61) draped over the product and welded to the support keeping the flap element (70a) in said closing position and sealingly sealing at least one hole (70 ) on the side wall, optionally, where extraction of the drilling tool takes place either when the final desired vacuum level has been reached within the support (7) or when the vacuum has reached an intermediate level between the desired vacuum level and the level ofpressure present before the start of air removal.
[0012]
12. Method according to claim 8 or 11, characterized in that the progressive perforation of the side wall of the support comprises, optionally, starting from a single breaking point, a cut line (70b) in the side wall, said cut line having an open conformation such that the tab element (70a) is integral with the side wall and delimited by said open cut line, said tab element (70a) being connected to the side wall by a hinge line (70c) extending between ends of said cut line (70b).
[0013]
13. Method according to any one of the preceding claims from 7 to 12, characterized in that said support (7) is a tray having a bottom wall of polygonal shape, optionally rectangular, and in which the perforation step comprises forming said hole(s) in correspondence with corner(s) of the side wall, further wherein said support (7) is a tray having one or more horizontal edges present in the upper half of the area of side wall, each of said horizontal edges being located in correspondence with one of said corners, wherein each of said horizontal edges is substantially in the shape of a right triangle, and wherein vertical and mutually perpendicular facets emerge from orthogonal converging edges of each of said horizontal edges; the drilling step comprises forming said hole(s) in correspondence with a respective corner, optionally in the form of an opening through the portion of the side wall defining one of said vertical facets.
[0014]
14. Vacuum bag package (700), for example, of the type obtainable with the method as defined in any one of claims 7 to 13, characterized in that it comprises: a tray (701) having a bottom wall (702 ) and a sidewall (703) extending upwardly from said bottom wall (702), the sidewall having at least one hole (70) in the sidewall (703); a flap element (70a) connected to the side wall of the tray (703), wherein the flap element (70a) is positioned in correspondence with said hole (70); a product (706) loaded into the tray (701); a draped film (705) over the product and welded to an inner surface of the tray (701) wherein at least a portion of said film (705) holds the flap element (70a) in a fixed position relative to the sidewall ( 703) and closes at least said one hole (70) sealingly.
[0015]
15. Vacuum bag package according to claim 14, characterized in that the flap element (70a) is aligned with the side wall of the tray (703) and substantially closes said hole (70), the film (705) adhering to the tab element (70a) which coincides with the contour of said hole (70) and remains level with respect to a surface of the sidewall (703).
[0016]
16. Vacuum bag package according to claim 14 or 15, characterized in that the flap element (70a) is integral with the side wall (703) and delimited by an open cut line (70b), the said flap element (70a) being connected to the side wall (703) by a hinge line (70c) extending between ends of said cut line (70b), and wherein the hinge line (70c) has length ( l) not greater than the maximum width (w) of the flap element measured parallel to the hinge line (70c), but preferably greater than 0.2 (1/5) of said maximum width (w), the height (h) ) of the flap element - measured perpendicular to the hinge line - being greater than 0.2, optionally greater than 0.5 of the length (l) of the hinge line, but less than 3 times the length of the same hinge line.
[0017]
17. Vacuum bag package according to any one of the preceding claims 14 to 16, characterized in that the side wall of the support (7) ends upwardly in an outwardly projecting horizontal rim (704), said film (705) also being welded to the upper surface of said horizontal rim, wherein the bottom wall of the tray (702) is polygonal in shape, optionally rectangular; wherein the hole or holes (70) is/are located in correspondence with corner(s) of the side wall (703); wherein the sidewall (703) comprises one or more horizontal edges (707) present in the upper half of the area of the sidewall (703), wherein each of said horizontal edges (707) is located in correspondence with one of said corners , optionally wherein each of said horizontal edges (707) is substantially in the shape of a right triangle, and wherein vertical and mutually perpendicular facets emerge from orthogonal converging edges of each of said horizontal edges, wherein each hole (70 ) is formed in correspondence with a respective corner.
[0018]
18. Vacuum bag package according to any one of the preceding claims 14 to 17, characterized in that the sidewall (703) ends upwardly in an outwardly projecting horizontal rim (704), wherein the sidewall (703) comprises one or more horizontal edges (707) present in the upper half of the sidewall area (703) and wherein - on an inner edge of each horizontal edge (707) - the sidewall (703) has a bulge of protection, each horizontal edge (707) being positioned vertically at a lower height compared to said horizontal rim projecting outwardly (704) and extending between said protrusion and an additional side wall portion extending from the horizontal edge ( 707) and ending in said horizontal rim (704).

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同族专利:

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公开号 | 公开日

---

EP2722279A1|2014-04-23|

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EP3190056A1|2017-07-12|

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AU2017208376A1|2017-08-17|

---

US20190185236A1|2019-06-20|

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NZ736428A|2019-03-29|

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US20160176598A1|2016-06-23|

---

EP3028948B1|2017-08-30|

---

EP3190056B1|2018-12-12|

---

RU2663067C2|2018-08-01|

---

US10220994B2|2019-03-05|

---

ES2648130T3|2017-12-28|

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AU2017248471B2|2019-08-22|

---

EP3028948A1|2016-06-08|

---

AU2013333921A1|2015-05-07|

---

US11148863B2|2021-10-19|

---

NZ707808A|2017-09-29|

---

DK3190056T3|2019-04-01|

---

EP2722279B1|2017-08-23|

---

WO2014060507A1|2014-04-24|

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RU2015114089A|2016-12-10|

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AU2013333921B2|2017-08-03|

---

NZ733759A|2018-07-27|

---

PL3028948T3|2018-01-31|

---

ES2715188T3|2019-06-03|

---

AU2017208376B2|2019-07-18|

---

BR112015008923A2|2017-07-04|

---

ES2649538T3|2018-01-12|

---

AU2017248471A1|2017-11-02|

---

PL2722279T3|2017-12-29|

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法律状态:
2018-11-21| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2019-12-17| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2021-07-20| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2021-08-31| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 17/10/2013, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

---

申请号 | 申请日 | 专利标题

---

EP12189327.5|2012-10-19|

---

EP12189327.5A|EP2722279B1|2012-10-19|2012-10-19|Apparatus and method for vacuum skin packaging of a product and a skin packaged product.|

---

PCT/EP2013/071704|WO2014060507A1|2012-10-19|2013-10-17|Apparatus and method for vacuum skin packaging of a product and a skin packaged product|

---